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bug#9181: 24.0.50; Alpha transparency no longer works

From: David De La Harpe Golden
Subject: bug#9181: 24.0.50; Alpha transparency no longer works
Date: Thu, 28 Jul 2011 13:10:33 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110626 Icedove/3.1.11

On 25/07/11 21:41, Luka Novsak wrote:
My last build of emacs from source checked out of the trunk on
2011-07-21 broke transparency. My former build was several weeks old, so
can't say how old this is exactly.

Starting from emacs -Q I do (set-frame-parameter (selected-frame) 'alpha
'(90 90)), which should(?) work, but doesn't anymore.

Works for me (emacs trunk rev 105334)

Note this feature depends on compositing being active: all it does is set the relevant x11 window property to request the compositing manager render the window with some alpha. So it has no effect if you've, say, turned off compositing (sometimes called "desktop effects") in a window manager capable of it (say XFCE), or have switched to a low-requirements desktop environment / window-manager that doesn't do it at all.

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